Finding the Fourth Proportional to 90,335.42, 135,355.30 and 54,688.69

Step by Step Solution

1. Step 1: Write the proportion equation
   90,335.42 : 135,355.30 = 54,688.69 : x
2. Step 2: Convert to fraction form
   90,335.42/135,355.30 = 54,688.69/x
3. Step 3: Cross multiply
   90,335.42x = 135,355.30 × 54,688.69
4. Step 4: Simplify right side
   90,335.42x = 7,402,404,041.56
5. Step 5: Solve for x
   x = 7,402,404,041.56/90,335.42
6. Step 6: Final answer
   x = 81,943.54